gui/macosx: fix a side effect when the playlist's splitview is resizing in embedded window.

Signed-off-by: Pierre d'Herbemont <pdherbemont@free.fr>

modules/gui/macosx/embeddedwindow.m

@@ -275,6 +275,8 @@
 {
 	if([splitView isVertical])
 		return proposedPosition;
+	else if ( splitView == o_vertical_split )
+		return proposedPosition ;
 	else {
 		float bottom = [splitView frame].size.height - [splitView dividerThickness];
 		if(proposedPosition > bottom - 50) {